| 单词 |
photocathode |
| 释义 |
photocathode Electronics.|fəʊtəʊˈkæθəʊd|
Also photo-cathode, † -kathode.
[a. G. photokathode (P. Selényi 1929, in Physik. Zeitschr. XXX. 933/1): see photo- 1 and cathode.]
A cathode which emits electrons when illuminated, thereby allowing an electric current to pass.
1930Sci. Abstr. A. XXXIII. 525 (heading) Red-sensitive sodium photo-kathodes (photo-electric cells). 1931Physics I. 343 If a silver surface is first oxidized in an electrical discharge, and then baked in the presence of caesium vapor, it may be converted into a photo-cathode of remarkable sensitivity. 1957Proc. Inst. Electr. Engin. CIV. b. 470/2 The photo-electric surface developed by Koller in 1929, consisting of a complex mixture of silver, oxygen and caesium, was the first of the really efficient modern photo-cathodes and it is still in use, especially when red or infra-red sensitivity is required. 1969New Scientist 10 July 21/1 An image tube consists of a photo⁓cathode which emits electrons in direct proportion to the amount of light falling on it. |
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